Hiroko (内木場博子) Uchikoba
ID 695692
Born : 1982 Cat. W40 Ultrarunner since 2015 JPN
34
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
50
DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details
1
Countries visited ?JPNJapan
55,9%
Rank quotient ?This runner's calculation uses 34 eligible race(s): Σ(rank − 1) = 15 085; Σ finishers = 26 979. 15 085 / 26 979 × 100 = 55.91%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed34
Km — ultra races3 120 km
> 100 km8
Longest race120,0 km
36th Fuji 5 Lakes Sparta Challenge — 19/4/2026

Km per year (ultra races)

360
4 races
2022
365
4 races
2023
2024
220
2 races
2025
220
2 races
2026

Race types (share of distance)

Road93,6%
Trail6,4%

Wins & podiums (ultra)

🏆 Win0
🏆 Win F0
🏅 Top 30
🏅 Top 3 F2
Longest winning streak0
Current streak0

Records

100 km11h27'4712 h102,07 km

HISTORY

34 race(s)
DateRacePerf.Rk
2026
17.05 100km JPN32th Yatsugatake Nobeyama 100 km 11:50:08 h269
19.04 120km JPN36th Fuji 5 Lakes Sparta Challenge 12:58:07 h96
2025
18.05 100km JPN31th Yatsugatake Nobeyama 100 km 12:01:01 h298
20.04 120km JPN35th Fuji 5 Lakes Sparta Challenge 13:44:48 h194
2023
01.07 8h JPN29th 8-Hour Endurance Race Tokorozawa 68.600 km24
04.06 78km JPN30. Ultramarathon Okumusashi 8:26:01 h132
21.05 100km JPN29th Yatsugatake Nobeyama 100 km 11:27:47 h91
16.04 118km JPN33th Fuji 5 Lakes 118 km Challenge 13:01:39 h98
2022
03.07 8h JPN28th 8-Hour Endurance Race Tokorozawa 63.700 km64
05.06 78km JPN29. Ultramarathon Okumusashi 8:54:18 h302
22.05 100km JPN28th Yatsugatake Nobeyama 100 km 12:08:53 h276
17.04 118km JPN32th Fuji 5 Lakes 118 km Challenge 14:13:21 h236
2021
04.07 8h JPN27th 8-Hour Endurance Race Tokorozawa 73.500 km93
2019
07.10 118km JPN1st Fuji 5 Lakes 118 km Autumn Challenge 14:23:14 h98
14.09 12h JPN14. Shonan Int. Relay Marathon 12 Hour Run 102.070 km6
29.06 8h JPN25th 8-Hour Endurance Race Tokorozawa 68.600 km88
02.06 78km JPN26. Ultramarathon Okumusashi 9:33:50 h688
19.05 100km JPN25th Yatsugatake Nobeyama 100 km 13:13:59 h904
21.04 118km JPN29th Fuji 5 Lakes 118 km Challenge 14:25:46 h323
2018
15.09 12h JPN21. Hiratsuka 12 hour race 100.300 km10
30.06 8h JPN24th 8-Hour Endurance Race Tokorozawa 58.800 km86
17.06 100km JPN2nd Nikko 100km Ultramarathon 11:56:56 h312
03.06 78km JPN25. Ultramarathon Okumusashi 10:59:04 h1065
20.05 100km JPN24th Yatsugatake Nobeyama 100 km 13:56:05 h1516
22.04 100km JPN28th Fuji 5 Lakes 100 km Challenge 13:44:01 h1116
2017
09.09 12h JPN20. Hiratsuka 12 hour race 96.880 km11
02.07 100km JPN1st Nikko 100km Ultramarathon 13:43:02 h931
04.06 78km JPN24. Ultramarathon Okumusashi 10:02:39 h876
23.04 100km JPN27th Fuji 5 Lakes 100 km Challenge 13:31:35 h1061
2016
02.07 8h JPN22nd 8-Hour Endurance Race Tokorozawa 55.182 km134
05.06 78km JPN23. Ultramarathon Okumusashi 10:04:19 h893
22.05 100km JPN22nd Yatsugatake Nobeyama 100 km 13:50:22 h1250
2015
12.07 8h JPN21st 8-Hour Endurance Race Tokorozawa 52.688 km163
17.05 100km JPN21st Yatsugatake Nobeyama 100 km 13:57:12 h1415